Sentence 1: On the rapidly receding platform, a veritable army of policemen could be seen.

Sentence 2: A the train sped away from the station an army of policemen could be seen filling the platform.
Is this second sentence entailed by the first?

Answer: it is not possible to tell


Sentence 1: Guards would regulate those who entered and departed.

Sentence 2: People entering and departing were regulated by guards.
Is this second sentence entailed by the first?

Answer: yes


Sentence 1: In 1868 the Satsuma and Choshu clans, never a real threat to Tokugawa authority as long as they remained rivals, joined forces to overthrow the shogun and restore the authority of the emperor, the 14-year-old Mitsuhito.

Sentence 2: Satsuma and Choshu clans joined forces in 1868.
Is this second sentence entailed by the first?

Answer:
yes